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Helping Out SSDs

Nov 04, 2009, 22:33 (0 Talkback[s])
(Other stories by Jeffrey B. Layton)

[ Thanks to An Anonymous Reader for this link. ]

"In our last article, we did a deep-dive on the anatomy of SSDs, starting with the basics of the NAND Flash cells that are floating-gate transistors. The transistors are then combined to form pages, which are formed into blocks, which are formed into planes, which are formed into chips, which are formed into drives. As discusssed, floating-gate transistors have a few limitations:

Very fast read performance
Asymmetric read/write performance (reads are 2-3 orders of magnitude faster than writes) There are data retention limitations due to leakage and due to exercising the cells (i.e. using the erase/program cycles)
Shrinking the dies to increase density increases the probability of data corruption from erase/program functions disturbing neighboring cells
NAND Flash cells have a limited number of erase/program cycles before they can no longer retain data"

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